<template>
    <div class="login_container">
       <div class="login_box">
           <div class="avatar_box">
               <img src="../assets/logo.png" alt="">
           </div>
            <el-form ref="loginFormRef"  label-width="0px" class="login_form" :model="loginForm" :rules="loginFormRules" >
                    <el-form-item prop="username">
                      <el-input  v-model="loginForm.username" prefix-icon="iconfont icon-user"></el-input>
                    </el-form-item>
                    <el-form-item prop="password">
                      <el-input v-model="loginForm.password" type="password" prefix-icon="iconfont icon-lock_fill"></el-input>
                    </el-form-item>
                    <el-form-item class="btns">
                      <el-button type="primary" @click="login">登录</el-button>
                       <el-button type="info" @click="resetLoginForm">重置</el-button>
                    </el-form-item>
            </el-form>
       </div>
    </div>
</template>
<script>
    export default {
        // 存放数据
        data () {
            return {
                // 表单数据
                loginForm: {
                    username: 'admin',
                    password: '123456'
                },
                // 验证验证规则
                loginFormRules: {
                    username: [
                         { required: true, message: '请输入用户名称', trigger: 'blur' },
                         { min: 3, max: 10, message: '长度在 3 到 10 个字符', trigger: 'blur' }
                    ],
                    password: [
                         { required: true, message: '请输入用户密码', trigger: 'blur' },
                         { min: 6, max: 15, message: '长度在 6 到 15 个字符', trigger: 'blur' }
                    ]
                }
            }
        },
        methods: {
            // 重置表单
            resetLoginForm () {
                this.$refs.loginFormRef.resetFields()
            },
            login () {
                // 登录前的预验证
                this.$refs.loginFormRef.validate(async valid => {
                   if (!valid) return false
                   // a:调用登录接口
                   const { data: res } = await this.$html.post('/login', this.loginForm)
                   // b:社会之弹框提示功能
                   if (res.meta.status !== 200) return this.$message.error('登录失败，请输入正确的用户名和密码')
                   this.$message({
                       message: '登录成功',
                       type: 'success'
                   })
                   // c:将token保存到sessionStorage中,并实现页面跳转
                   // c1：将token保存到sessionStorage中
                   window.sessionStorage.setItem('token', res.data.token)
                   // c2：实现页面跳转
                   this.$router.push('/home')
                })
            }
        }
    }
</script>
<style lang="less" scoped>
    .login_container {
        background-color:#2b4b6b;
        height: 100%;
    }
    .login_box {
        width:450px;
        height: 300px;
        background-color: #fff;
        position: absolute;
        top:50%;
        left: 50%;
        transform: translate(-50%,-50%);
        border-radius: 3px;
        .avatar_box {
            width:130px;
            height: 130px;
            border-radius: 50%;
            border: 1px solid #eee;
            box-shadow: 0 0 10px #ddd;
            padding: 10px;
            position: absolute;
            left: 50%;
            background-color: #fff;
            transform: translate(-50%,-50%);
            img {
                width:100%;
                height: 100%;
                border-radius: 50%;
                background-color: #eee;
            }
        }
        .login_form {
            position: absolute;
            bottom:0;
            width:100%;
            padding: 0px 20px;
            box-sizing: border-box;
        }
        .btns {
            display: flex;
            justify-content: flex-end;
        }
    }
</style>